187,563 research outputs found

    Lu, Nancy C.

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    National Taiwan University, Taiwan, BS, 1963 University of Wyoming, Laramie, Wyoming, MS, 1964 University of California, Berkeley, PhD, 1973 University of California, Berkeley, Post-doctoral Fellowship 1974https://scholarworks.sjsu.edu/erfa_bios/1355/thumbnail.jp

    Virtual to Real Reinforcement Learning for Autonomous Driving

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    Reinforcement learning is considered as a promising direction for driving policy learning. However, training autonomous driving vehicle with reinforcement learning in real environment involves non-affordable trial-and-error. It is more desirable to first train in a virtual environment and then transfer to the real environment. In this paper, we propose a novel realistic translation network to make model trained in virtual environment be workable in real world. The proposed network can convert non-realistic virtual image input into a realistic one with similar scene structure. Given realistic frames as input, driving policy trained by reinforcement learning can nicely adapt to real world driving. Experiments show that our proposed virtual to real (VR) reinforcement learning (RL) works pretty well. To our knowledge, this is the first successful case of driving policy trained by reinforcement learning that can adapt to real world driving data

    Unconventional electronic Raman spectra of borocarbide superconductors

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    Borocarbide superconductors, which are thought to be conventional BCS-type superconductors, are not so conventional in several electronic Raman properties. Anisotropic gap-like features and finite scattering strength below the gap were observed for the RRNi2_2B2_2C (RR = Lu, Y) systems in our previous study. The effects of Co-doping on the 2Δ\Delta gap-like features and the finite scattering strength below and above the gap are studied in RR = Lu (B = B11^{11}) system. In superconducting states, Co-doping strongly suppresses the 2Δ\Delta peak in both B2g_{2g} and B1g_{1g} symmetries. Raman cross-section calculation which includes inelastic scattering shows a relatively good fit to the features above the 2Δ\Delta peak, while it does not fully account for the features below the peak.Comment: 2 pages, 1 figur

    Petrophysical Evaluation and Reservoir Characterization of the Zubair Formation in the Luhais and Rachi oil fields, Southern Iraq

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    The Barremian succession in the present study is represented by the Zubair Formation which the most significant sandstone reservoir in Iraq.The area of study is located in the Southern part of Iraq at the Luhaisand Rachi oil fields, within the Mesopotamian basin. The thickness of the Zubair Formation is about 450 m in the studied area. It is divided into three lithofacies:- The upper unit is composed mostly of shale layers, the middle unit is consists of thick layers of sandstone rocks and the lower ones is consists mainly of Shale with less sandstone layers. These units are characterized by three types of petrophysical features according to total porosity/effective porosity: - High-moderate effective porosity rocks (type I), moderate effective porosity rocks (type II) and low-non pores rocks (type III). The upper unit of theZubair Formation at the Luhais oil field is characterized by two horizons. The first is showing high resistivity-high gamma ray which represents the upper part; while the lower ones is shown low resistivity-low gamma ray. There are two good reservoir horizones with high oil saturation (low water saturation) in this unit at the Rachi oil field and Lu-3 borehole, while at the Lu-12 is appeared as one uncontaneoushorizon. The middle is characterized by two subzones in the southwestern part of Luhais oil field (Lu-12). The upper one characterized by high- moderate effective porosity while the lower one characterized by moderate effective porosity because of presence a low volume of shale. This unit is dominated by low resistivity-low gamma ray with three susbended bands of high resistivity-low gamma ray, these appeared in both studied oil fields. The high percentage of water saturation in this unit caused the lack of clarity of the oil saturation, which appears in narrow bands The lower unit is represented the shale – dominated member of Zubair Formation, with low to non-pores rocks. This appeared in all studied wells. There are limit presences for the high- moderate effective porosity of rock within the sand bands lithofacies appears in these wells. This unit is characterized by alternative the high resistivity-high gamma ray horizon with the low resistivity-low gamma ray horizon as four cycles. There are two good reservoir horizons with high oil saturation (low water saturation) in this unit with a distribution similar to that found in the upper part. From the reservoir geology which represent by property modelling, preparing data, construction of three-dimension clump and scale up for the studied oil fields. The Rachi oil field is appeared the better hydrocarbon saturation compared to Luhais oil field, although the Luhais oil field (Lu-3 and Lu-12) is the best of pertophysicalproperties. This indicates that the Rachi oil field was affected by the structural position as indicated by the model, while the model did not show any structural properties in the field of Lahis. Therefore, the structural and/or stratigraphic positions have the greatest influence on the hydrocarbon accumulation, regardless of petrophysical properties

    L'action directe en correctionnelle: la Ligue d'action du bâtiment et l'affaire de Versoix (1931)

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    La Ligue d’Action du Bâtiment (L.A.B.), organe de combat anarcho-syndicaliste, a pratiqué l’action directe de façon systématisée sur les chantiers genevois. Ses actions coup-de-poing – bagarres, destruction, sabotage – lui ont valu de nombreux passages devant le tribunal correctionnel dans la première moitié des années trente, soulignant la tension constante entre légitimité d’une lutte et illégalité des moyens employé

    Oxide nanoparticle exsolution in Lu-doped (Ba,La)CoO3

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    This study investigated Lu doping of BaLaCoO and its influence on the exsolution of oxide nanoparticles (NPs). As a result of Lu doping, we observed the phase segregation into the main BaLaCoLuO (BLCO-Lu) phase and the secondary BaLaCoLuO (BCO-Lu) phase. We noticed the exsolution of BCO-Lu nanoparticles on the main BLCO-Lu phase. Moreover, the BLCO-Lu phase exsolved in the form of nanoparticles on the adjacent BCO-Lu grains. That shows that the phases are covered with mutually exsolved oxide NPs. In addition, trace amounts of the BaLuCoO phase are detected. We noticed that the exsolved oxides even in the as-prepared sample were fine (average size of 18 nm), and well distributed with a dense population of NPs above 280 per 1 μm. Furthermore, we showed that the size and shape of the exsolved oxide NPs can be controlled by varying the annealing temperature. For example, at 800 °C the exsolved oxides segregate and form two different shapes; spherical and cuboidal, with an average size of 31 nm and NP population of about 23 NPs per μm. Meanwhile, with lowering the temperature to 400 °C the oxides form only spherical and quite evenly distributed NPs with the occurrence of 137 NPs per 1 μm. The obtained results open the possibility of tailoring a novel, more catalytically active material for future applications in electrochemical devices.Project FunKeyCat is supported by the National Science Centre, Poland under the M-ERA.NET 2, which has received funding from the European Union's Horizon 2020 research and innovation program under grant agreement no 685451. The Research Council of Norway is also acknowledged for support to the Norwegian Center for Transmission Electron Microscopy (NORTEM) (no. 197405/F50)
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